Right. PS4 doesn't have any hardware to match SHAPE. The audio processor in the PS4 is just a compression/decompression piece and does nowhere near what shape does, anything advanced to match and beyond has to be handled in software using CU, which has been estimated would drain 100-200 Gflops to match shape, or even more if your doing audio raycasting.
Did you read my full post? I never said shadows and reflections in the environment were dynamic. However lighting, reflections and shadowing all happen dynamically and in real-time in the perspective of your vehicle. If the sun is not moving, why would you have to change the shadow cast by a lamp post?
Forza team is being smart and focusing on what matters, I mean who cares if one game is actively rendering the environment that's off screen. For example smart programming can save resources by only accounting on what's seen by the player, likewise unless you can somehow exit your vehicle in the middle of a race and scrutinize every shadow cast in the environment by objects in the field, then you need to quit gaming and find another hobby quick.
To be clear, I'm not saying DC is not doing more technically, but I remember when the first DC screens showed shadows in the car casting all around, several people claimed it a difference from F5 or not possible to do in F5 because it's shadows are baked, but as you can see the effect in car is the same because in relation to the vehicle, the effect is exactly the same as DC.
The shadows that you see in the cabin are dynamic and impossible to bake